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ASSET RETIREMENT OBLIGATIONS - Estimated Payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Estimated payments of asset retirement obligations:
2025	$ 3,621
2026	4,763
2027	7,043
2028	9,312
2029	9,584
Thereafter	244,592
Aggregate undiscounted asset retirement obligations	278,915
Less: effect of discounting	(120,138)	$ (116,200)
Total asset retirement obligations	158,777	150,443	$ 149,813
Less: current portion	(3,621)
Non-current asset retirement obligations	155,156	146,925
Surety bonds outstanding to performance of reclamation obligations	$ 170,100	$ 173,500

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- Definition

Undiscounted amount of estimated future payments of asset retirement obligations.

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- Definition

Amount necessary to reduce estimated payments of asset retirement obligations to present value.

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- Definition

Amount of surety bonds that are available for the future payment of reclamation obligations.

+ References

No definition available.

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- Definition

Amount of estimated payments of asset retirement obligations in the fifth fiscal year following the latest fiscal year.

+ References

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Amount of estimated payments of asset retirement obligations in the fourth fiscal year following the latest fiscal year.

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Amount of estimated payments of asset retirement obligations in the next fiscal year following the latest fiscal year.

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Amount of estimated payments of asset retirement obligations after the fifth fiscal year following the latest fiscal year.

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Amount of estimated payments of asset retirement obligations in the third fiscal year following the latest fiscal year.

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Amount of estimated payments of asset retirement obligations in the second fiscal year following the latest fiscal year.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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- Definition

Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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